Curium-243 (Cm-243)

Identity

Protons

96

Neutrons

147

Mass number

243

Mass

243.1 ± 1.6 u

Mass excess

57.182 MeV

Spin

5/2+*

Stability

Half-life: 29.1 years

Natural occurrence

Not found in nature

Decays to

• alpha 100.0 % → Pu-239
• electron capture 0.29 % → Am-243
• spontaneous fission 5.3e-9 %